Research brief: Mortality risk measure queried

The Ankle Arm Index (AAI) measure of mortality risk, based on the ratio of systolic blood pressures in the arm and ankle, may need to be reconfigured, US researchers have found.

A ratio of less than 0.9 was previously thought to be associated with an increased mortality risk, but a study of almost 6,000 people with an average age of 73 suggests that the cut-off should be raised. Patients with an AAI less than 1.0 or greater than 1.4 were all found to be at significantly raised risk of all-cause mortality (Circulation 2006; 113: 329).

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